Su-57 Felon Proves Stealth and EW Evasion in Ukraine’s Deadliest Airspace, Says Rostec CEO

(DEFENCE SECURITY ASIA) — Russia’s fifth-generation Sukhoi Su-57 “Felon” has become one of the most important military aviation developments of the Ukraine war after Rostec CEO Sergey Chemezov confirmed that the aircraft has repeatedly operated in one of the world’s most electronically contested battle environments while successfully avoiding enemy radar and electronic warfare systems.

In a bold assertion underscoring Russia’s advancements in fifth-generation fighter technology, he declared that the Su-57 aircraft has successfully evaded enemy radars and electronic warfare systems during its deployment in the special military operation (SVO) zone in Ukraine.

 “The Su-57, used in the special military operation zone, successfully evades enemy radars and electronic warfare systems,” during remarks made ahead of a State Council meeting on workforce development recently.

Chemezov strengthened this claim by explaining that the aircraft “evades all kinds of obstacles very well, I mean radars and electronic warfare systems,” while noting that Russian pilots flying the Su-57 remain consistently satisfied with its survivability and combat performance in real wartime conditions, feedback that Rostec has already used to introduce wide-ranging upgrades to the jet’s avionics, sensors, engines, and weapons systems.

This confirmation comes at a time of continued Western sanctions, expanding NATO military support for Ukraine, and the heaviest concentration of air-defence and electronic warfare systems in Europe since the Cold War, placing the Su-57 at the centre of a wider reassessment of how mature and capable Russia’s fifth-generation fighter programme has become.

Chemezov’s remarks are significant not only because they highlight the Su-57’s ability to evade radar and electronic warfare, but also because they indicate that the aircraft has moved beyond cautious standoff operations and is now being actively tested, refined, and validated in live combat against Western-supplied systems specifically designed to counter stealth aircraft.

In modern air warfare—where survival increasingly depends on controlling the electromagnetic spectrum rather than sheer speed or manoeuvrability—the Su-57’s continued operation within Ukraine’s layered air-defence environment suggests a meaningful shift in Russian airpower doctrine, as airspace denial, disruption of enemy kill chains, and counter-stealth detection now define success in high-intensity aerial combat.

Russia’s willingness to expose its most advanced fighter to such a dense and hostile electromagnetic battlespace also reflects growing institutional confidence that the Su-57’s combined stealth shaping, electronic warfare suite, and sensor fusion are sufficient to manage risk against modern Western-supplied air-defence networks.

Operational use in Ukraine is therefore serving not merely as combat employment, but as a live-fire laboratory in which Russian engineers and tacticians can observe how a fifth-generation platform performs when confronted by layered radar coverage, adaptive electronic attack, and real-time intelligence sharing.

This combat-driven refinement cycle suggests that the Su-57 is evolving away from its early reputation as a limited-production demonstrator and toward a more mature combat system shaped by real operational lessons rather than theoretical performance metrics.

If sustained without losses, such deployments could significantly alter external perceptions of Russian aerospace capabilities, particularly among non-Western air forces seeking alternatives to US-led fifth-generation ecosystems amid tightening export controls and geopolitical pressure.

Design Philosophy and the Evolution of Russia’s Fifth-Generation Combat Doctrine

The Sukhoi Su-57 represents Russia’s first operational leap into fifth-generation fighter aviation, conceived under the PAK FA programme in the early 2000s as a multi-role combat aircraft capable of executing air superiority, deep strike, and suppression of enemy air defences missions within environments saturated by modern surface-to-air missile systems and networked sensor grids.

Unlike Western fifth-generation platforms that prioritise extreme very-low-observable characteristics as the cornerstone of survivability, the Su-57’s design philosophy reflects a distinctly Russian interpretation of air combat dominance, one that deliberately balances reduced radar cross-section with super-maneuverability, long-range sensors, multi-band radar coverage, and high-energy kinematic performance to generate survivability through a layered, adaptive approach rather than absolute invisibility.

The aircraft’s blended airframe, extensive use of radar-absorbent materials, internal weapons bays, and carefully angled fuselage surfaces are intended to reduce detection ranges rather than eliminate detection entirely, allowing the Su-57 to operate within threat envelopes while relying on electronic warfare, sensor fusion, and flight performance to break enemy targeting solutions before engagement thresholds are reached.

Russian estimates place the Su-57’s radar cross-section between 0.1 and 1 square metres depending on aspect and configuration, a figure that, while higher than American stealth benchmarks, still represents a dramatic reduction compared to fourth-generation fighters and significantly complicates detection and tracking timelines for legacy and even modern air-defence radars.

Measuring approximately 20.1 metres in length with a wingspan of 14.1 metres and a maximum take-off weight approaching 35,000 kilograms, the Su-57 is optimised for long-range operations, boasting an internal fuel range of roughly 3,500 kilometres that enables deep strike and patrol missions without immediate reliance on aerial refuelling.

Power is currently provided by twin AL-41F1 turbofan engines featuring three-dimensional thrust vectoring, enabling super-maneuverability and sustained supercruise at approximately Mach 1.6, with a maximum speed of Mach 2.0, characteristics that allow the aircraft to dictate engagement geometry and disengage rapidly from hostile airspace when required.

Central to the Su-57’s combat architecture is the N036 “Byelka” active electronically scanned array radar complex, which integrates multiple AESA arrays distributed across the nose, wings, and fuselage to provide multi-directional coverage, track up to 60 targets simultaneously, and engage multiple threats at ranges exceeding 400 kilometres under optimal conditions.

The inclusion of L-band AESA arrays embedded in the wing leading edges reflects a deliberate emphasis on counter-stealth operations, exploiting frequency bands less affected by radar-absorbent materials and reportedly capable of detecting stealth aircraft at tactically meaningful ranges.

Complementing the radar suite is an advanced infrared search and track system, passive electronic support measures, and a helmet-mounted display that together allow Su-57 pilots to detect, track, and engage targets without emitting radar energy, a capability particularly relevant in environments dominated by electronic warfare and anti-radiation threats.

Ukraine as a Live-Fire Validation Environment for Stealth, EW, and Survivability

Since its initial deployment into the Ukraine theatre in 2022, the Su-57’s operational role has evolved in a manner that reflects both technological caution and doctrinal adaptation, with early missions conducted almost exclusively from within Russian airspace using long-range standoff munitions designed to neutralise high-value targets without exposing the aircraft to Ukraine’s layered air-defence network.

These early operations relied heavily on weapons such as the Kh-59M2 cruise missile and the R-37M long-range air-to-air missile, enabling the Su-57 to strike targets at distances exceeding 200 to 300 kilometres while remaining outside the effective engagement envelopes of systems such as the S-300 and US-supplied Patriot batteries.

By 2024 and into 2025, however, the operational tempo and mission profile of Su-57 deployments began to shift, with the aircraft increasingly conducting closer-range operations involving precision-guided glide bombs equipped with UMPK kits that extend the effective range of unguided munitions to approximately 60–80 kilometres.

This transition marked a subtle but important shift in Russian confidence, suggesting that accumulated combat data, electronic warfare performance, and survivability assessments had reached a threshold where deeper operational penetration was deemed acceptable under specific conditions.

The introduction of the Su-57 into suppression of enemy air defences roles further underscores this evolution, as SEAD missions inherently require exposure to hostile sensors and electronic warfare systems, placing the aircraft’s stealth, electronic countermeasures, and situational awareness under continuous stress.

Chemezov’s confirmation that the Su-57 has successfully evaded both radar and electronic warfare systems during these operations strongly suggests that the aircraft’s integrated survivability architecture—rather than any single feature—has proven resilient against Ukraine’s increasingly sophisticated electromagnetic battlespace.

This battlespace includes not only Soviet-era air-defence systems but also modern Western sensors, electronic warfare support, and intelligence fusion provided by NATO partners, making Ukraine one of the most demanding test environments for any combat aircraft currently in service.

As of December 2025, no confirmed Su-57 combat losses have been publicly acknowledged, a fact that Russia has leveraged to reinforce its narrative of platform survivability, even as unverified reports and speculative damage claims circulate in the information domain.

While the limited number of Su-57 airframes—estimated between 20 and 30 operational units—naturally constrains deployment density, their sustained survival across repeated mission cycles nonetheless provides Russia with a rare opportunity to refine fifth-generation combat doctrine under real wartime conditions rather than controlled exercises.

Modernisation Momentum: Engines, Avionics, and the Product 30 Leap

One of the most consequential milestones in the Su-57’s ongoing evolution occurred on December 22, 2025, when Russia initiated flight testing of the aircraft equipped with the new “Product 177” fifth-generation turbofan engine, a development intended to resolve long-standing critiques surrounding propulsion performance and lifecycle limitations.

Chemezov described the new engine as delivering “a much longer service life, higher speed, longer range, and quite a number of superior characteristics,” signalling a step change in performance that could significantly enhance the aircraft’s supercruise efficiency, thrust-to-weight ratio, and thermal management profile.

The Product 177 engine is expected to deliver approximately 18 percent more thrust than the interim AL-41F1 while reducing fuel consumption and infrared signature, improvements that directly enhance survivability against both radar-guided and infrared-guided threats.

Full operational integration of the Product 30 is anticipated by 2026, at which point the Su-57 will, for the first time, operate in its originally intended propulsion configuration, closing a critical capability gap relative to Western fifth-generation platforms.

Beyond propulsion, combat feedback from Ukraine has reportedly driven upgrades across electronic warfare suites, mission computers, sensor fusion algorithms, and weapons integration, transforming the Su-57 from its early-production baseline into a progressively more lethal and survivable platform.

This iterative, combat-driven modernisation cycle mirrors the evolutionary path taken by Western platforms such as the F-16 and F-15 during decades of operational use, underscoring the reality that fifth-generation effectiveness is increasingly defined by software, data, and adaptability rather than static design specifications.

The cumulative cost of Su-57 development and production is estimated to exceed RUB 500 billion, equivalent to approximately USD 5.5 billion or MYR 26 billion, a significant investment for an economy operating under sustained sanctions and wartime expenditure pressures.

Despite these constraints, Russia has reportedly secured domestic orders exceeding 50 airframes, signalling a long-term commitment to the platform as the backbone of its future tactical aviation force structure.

Export Strategy, Sanctions Pressure, and the Global Market Equation

Russia’s effort to translate the Su-57’s combat narrative into export momentum has become increasingly visible, particularly following the public unveiling of the Su-57E export variant, which incorporates design refinements such as serrated engine nozzles intended to reduce radar and infrared signatures.

Chemezov has asserted that demand for the Su-57E is “huge,” with Algeria confirmed as the first export customer and initial deliveries reportedly commencing in late 2025, a development that positions the aircraft as a viable alternative to Western fifth-generation platforms for countries facing political or financial barriers to acquiring the F-35.

The unit cost of the Su-57 is estimated at approximately USD 35–40 million per aircraft, equivalent to MYR 165–190 million, significantly lower than the F-35’s flyaway cost, a pricing differential that enhances its appeal in cost-sensitive markets.

However, sanctions-related supply chain disruptions and recent decisions to suspend expansion of Su-57 production facilities highlight the structural challenges confronting Russia’s aerospace industry, potentially limiting production rates and export scalability.

Nevertheless, Rostec’s emphasis on Ukraine-validated performance as a selling point reflects a broader shift in global arms markets, where combat-proven credentials increasingly outweigh theoretical capability claims in procurement decision-making.

Strategic Implications for Future Airpower Competition

Chemezov’s declaration that the Su-57 has successfully evaded radar and electronic warfare systems in Ukraine marks a symbolic inflection point in Russia’s fifth-generation aviation narrative, signalling a transition from aspirational capability to demonstrated operational relevance.

As NATO and allied air forces continue to expand F-35 fleets across Europe and the Asia-Pacific, the Su-57’s hybrid approach to survivability—combining reduced observability, electronic warfare, long-range sensors, and high-energy kinematics—offers an asymmetric counterweight to Western stealth doctrine.

For regions such as South Asia, the Middle East, and Southeast Asia, where airspace is increasingly contested and procurement diversification is a strategic priority, the Su-57’s maturation could introduce new variables into regional airpower balances.

Yet the aircraft’s ultimate impact will depend on production scale, sustained modernisation, and the successful integration of next-generation engines and software, factors that remain tightly coupled to Russia’s industrial resilience under prolonged geopolitical pressure.

What is now clear, however, is that the Su-57 has moved beyond the realm of speculative capability, entering instead the unforgiving arena of live combat validation, where evasion, survivability, and adaptability—not marketing claims—define the future of air dominance.

As the war in Ukraine continues to shape the evolution of modern warfare, the Su-57 Felon’s trajectory will remain a critical bellwether for the future of Russian aerospace power and the global competition for control of the skies.

— DEFENCE SECURITY ASIA